What reason did the state of South Carolina give for seceding from the union

The south favored the slavery and did not want it to end from the country.

Explanation:

The southern region of Carolina did not want to join the union of the United States of America because the northern region was in the favor of the slavery ending from the country and it wanted to set the slaves free.

But the southern area of the country did not want so. It did not want the practice of slavery to end so it decided not be a part of the union.